text: // @remove-file-on-eject
  /**
   * Copyright (c) 2015-present, Facebook, Inc.
   *
   * This source code is licensed under the MIT license found in the
   * LICENSE file in the root directory of this source tree.
   */
  'use strict';
  
  const fs = require('fs');
  const path = require('path');
  const chalk = require('chalk');
  const paths = require('../../config/paths');
  
  module.exports = (resolve, rootDir, srcRoots) => {
    // Use this instead of `paths.testsSetup` to avoid putting
    // an absolute filename into configuration after ejecting.
    const setupTestsFile = fs.existsSync(paths.testsSetup)
      ? '<rootDir>/src/setupTests.js'
      : undefined;
  
    const toRelRootDir = f => '<rootDir>/' + path.relative(rootDir || '', f);
  
    // TODO: I don't know if it's safe or not to just use / as path separator
    // in Jest configs. We need help from somebody with Windows to determine this.
    const config = {
      collectCoverageFrom: ['src/**/*.{js,jsx,mjs,ts,tsx}'],
      coverageReporters: ['lcov', 'json-summary', 'text'],
      coveragePathIgnorePatterns: ['<rootDir>/src/__mockData__/'],
      setupFiles: [resolve('config/polyfills.js')],
      setupTestFrameworkScriptFile: setupTestsFile,
      testMatch: [
        '**/__tests__/**/*.{js,jsx,mjs|ts|tsx}',
        '**/?(*.)(spec|test).{js,jsx,mjs,ts,tsx}',
      ],
      // where to search for files/tests
      roots: srcRoots.map(toRelRootDir),
      testEnvironment: 'node',
      testURL: 'http://localhost',
      transform: {
        '^.+\\.(js|jsx|mjs|ts|tsx)$': resolve('config/jest/babelTransform.js'),
        '^.+\\.css$': resolve('config/jest/cssTransform.js'),
        '^.+\\.(graphql)$': resolve('config/jest/graphqlTransform.js'),
        '^(?!.*\\.(js|jsx|mjs|ts|tsx|css|json|graphql)$)': resolve(
          'config/jest/fileTransform.js'
        ),
      },
      transformIgnorePatterns: [
        '[/\\\\]node_modules[/\\\\].+\\.(js|jsx|mjs|ts|tsx)$',
        '^.+\\.module\\.css$',
      ],
      moduleNameMapper: {
        '^react-native$': 'react-native-web',
        '^.+\\.module\\.css$': 'identity-obj-proxy',
      },
      moduleFileExtensions: [
        'web.js',
        'mjs',
        'js',
        'json',
        'web.jsx',
        'jsx',
        'node',
        'ts',
        'tsx',
      ],
    };
    if (rootDir) {
      config.rootDir = rootDir;
    }
  
    const overrides = Object.assign({}, require(paths.appPackageJson).jest);
    const supportedKeys = [
      'collectCoverageFrom',
      'coverageReporters',
      'coverageThreshold',
      'resetMocks',
      'resetModules',
      'snapshotSerializers',
      'watchPathIgnorePatterns',
    ];
    if (overrides) {
      supportedKeys.forEach(key => {
        if (overrides.hasOwnProperty(key)) {
          config[key] = overrides[key];
          delete overrides[key];
        }
      });
      const unsupportedKeys = Object.keys(overrides);
      if (unsupportedKeys.length) {
        const isOverridingSetupFile =
          unsupportedKeys.indexOf('setupTestFrameworkScriptFile') > -1;
  
        if (isOverridingSetupFile) {
          console.error(
            chalk.red(
              'We detected ' +
                chalk.bold('setupTestFrameworkScriptFile') +
                ' in your package.json.\n\n' +
                'Remove it from Jest configuration, and put the initialization code in ' +
                chalk.bold('src/setupTests.js') +
                '.\nThis file will be loaded automatically.\n'
            )
          );
        } else {
          console.error(
            chalk.red(
              '\nOut of the box, Create React App only supports overriding ' +
                'these Jest options:\n\n' +
                supportedKeys
                  .map(key => chalk.bold('  \u2022 ' + key))
                  .join('\n') +
                '.\n\n' +
                'These options in your package.json Jest configuration ' +
                'are not currently supported by Create React App:\n\n' +
                unsupportedKeys
                  .map(key => chalk.bold('  \u2022 ' + key))
                  .join('\n') +
                '\n\nIf you wish to override other Jest options, you need to ' +
                'eject from the default setup. You can do so by running ' +
                chalk.bold('npm run eject') +
                ' but remember that this is a one-way operation. ' +
                'You may also file an issue with Create React App to discuss ' +
                'supporting more options out of the box.\n'
            )
          );
        }
  
        process.exit(1);
      }
    }
    return config;
  };
  